• Korean Journal of Poultry Science
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• v.48 no.1
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• pp.1-12
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• 2021

We investigated the effects of breed, laying age, and egg storage period on the vitality of chicks using the Hwanggalsaek Jaeraejong, Korean Rhode Island Red, and Korean White Leghorn chicken breeds. Their eggs were collected during the early laying period (27~29 weeks) and late laying period (50~52 weeks) and were stored for 3 days, 7 days and 14 days. After the eggs hatched, the hatching time, production performance, and organ weight of chicks were investigated. IL-6 gene expression level and relative length of telomeres were analyzed to determine the physiological activity of the chicks. HSP gene expression level and heterophil to lymphocytes ratio were also analyzed to examine the degree of stress response in the chicks. The results showed that breed and laying age influenced the vitality of chicks, but the egg storage period did not. Korean Leghorn chicks were considered the weakest breed in terms of vitality owing to their low survival rate, small heart size, low physiological activity, and high stress response level. Although the survival rate of chicks produced in the early laying period was low, their high physiological activity and low stress response indicated that they had a high vitality than the chicks produced in the late laying period. In conclusion, to obtain chicks with high vitality, it would be desirable to select a high vitality breed and avoid the use of chicks produced in the late laying period.

• Korean Journal of Poultry Science
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• v.50 no.3
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• pp.119-124
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• 2023

This study was conducted to investigate the effect of dietary levels of the metabolic energy (ME) on performance, egg quality, and hatchability of Woorimatdag breeder hens during late laying period. A total of eighty Woorimatdag breeder hens were individually housed in cages from 48 to 64 weeks of age. The hens were assigned to two groups with different dietary ME levels: 2,500 kcal/kg and 2,700 kcal/kg. Each group consisted of four replicates of ten birds. The results indicated that the dietary ME levels did not have a significant effect on the body weight and feed intake of the breeder hens. The egg production was significantly (P<0.05) higher in breeder hens fed 2,500 kcal/kg ME than in those fed 2,700 kcal/kg ME from 48 to 52 weeks of age. However, the egg production was shown to be similar values in both groups from 52 to 64 weeks of age. No significant differences were observed between groups with respect to egg weight, eggshell thickness, and eggshell strength of breeder's eggs. There was no difference in the fertility and hatchability between dietary groups. In conclusion, 2,500 kcal/kg of dietary ME could be considered to meet Woorimatdag breeder hens requirement sufficiently during late laying period.

• KOREAN POULTRY JOURNAL
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• v.20 no.3 s.221
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• pp.111-113
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• 1988

닭의 계란은 크게 세부분- 난황(Yolk), 난백(Albumen)과 난각(Egg Shell)-으로 나뉜다. 종란속에서 병아리(계태아: 鷄胎兒)가 자랄 때에, 난황과 난백이 어떠한 역할을 하는가를 검토하여 보기로 한다.

• KOREAN POULTRY JOURNAL
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• v.42 no.6
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• pp.136-139
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• 2010

• KOREAN POULTRY JOURNAL
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• v.50 no.4
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• pp.176-178
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• 2018

• KOREAN POULTRY JOURNAL
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• v.14 s.156
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• pp.43-46
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• 1982

병아리 주령별 체중 차이를 이용해 육용계의 능력향상을 유도하고 성장속도를 빠른쪽으로 개량해 종란의 무게도 무거운 쪽으로 바꿔가고 있다.

• KOREAN POULTRY JOURNAL
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• v.42 no.7
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• pp.136-139
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• 2010

• KOREAN POULTRY JOURNAL
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• v.20 no.7 s.225
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• pp.116-119
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• 1988

한마리의 수탉은 8$\~$10배수의 암닭을 상대하는 것을 보아도 수탉에 대한 사양관리가 그 유전력 차이보다 얼마나 중요한가를 인식할 필요가 있다.

• KOREAN POULTRY JOURNAL
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• v.19 no.10 s.216
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• pp.66-69
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• 1987

특히 난계대 질병을 방지하기 위해서 종계는 엄격한 보균계 색출과 무감염 계군의 유지, 백신접종등 가능한 범위내에서 정부와 연구기관 그리고 부화업자들의 상호 협력하에 끊임없는 노력이 요망된다.

• KOREAN POULTRY JOURNAL
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• v.12 no.7 s.129
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• pp.88-93
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• 1980

이 글은 국내에서는 처음으로 SPF종란 생산사업에 착수하는 천호부화장의 오경록 질병연구실장이 호주에 세워진 SPF 시설을 돌아보고 기고한 글로써 그동안 많은 양계인들의 염원이던 SPF 종란 생산이 한걸음 가까워졌다는 실감을 준다.